I found A Chemical Hunger interesting when I first read it, but later people pointed out a whole bunch of severe mistakes (eg. [1] [2] [3]).
I don't know, I'm not a nutritionist, but the inaccuracies plus all the potato-conspiracy stuff made me doubtful of SMTM. My main takeaway was that no one, not even people in the field, really knows how food works.
https://www.lesswrong.com/posts/NRrbJJWnaSorrqvtZ/on-not-get... https://www.lesswrong.com/posts/7iAABhWpcGeP5e6SB/it-s-proba...
SMTM have never responded to it, and they have lost my confidence for that reason.